JPS6022871B2 - Line reservation method for button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a button telephone that accommodates an external line such as a central office line from a telephone office and a plurality of button telephones (hereinafter referred to as telephones), and performs exchange connection between the external line and the telephone or between the telephones. This is about refitting.

The conventional button telephone device consists of a main device mainly consisting of a relay circuit, a telephone with a mechanical lock button connected to the main device through a large number of indoor wiring, and a telephone with a mechanical lock button. This is a device that selects a connection between telephones or a central office line according to the operation, and makes and receives calls via the central office line via the main device, or makes calls between telephones by receiving power for communication from the main device, In most cases, the main device had only the function of connecting to the central office line and the function of supplying power for telephone calls, and did not have complete switching functions.

Therefore, the number of wires for each phone increases, which increases the number of installations and makes maintenance and inspection difficult.
Since the main device is composed of a relay, it is large in size and has poor reliability.In particular, it has the disadvantage that it is extremely difficult to provide services such as central office line reservations when making calls via central office lines. was.

The present invention has the purpose of fundamentally eliminating such drawbacks of the conventional art, and includes a line unit that performs a connection operation with an external line;
A plurality of terminal units to which a telephone is connected via each pair of voice line and data line, and which transmit and receive data signals to and from the telephone via a data line, and a voice line connected to each of these terminal units. and an exchange connection circuit that performs an exchange connection with an external line housed in the line unit;
In a button telephone device consisting of a main control unit equipped with a processor that controls each predetermined unit and exchange connection circuit according to information from a line unit and a terminal unit, information on the operation of the external line selection button of the telephone by the main control unit Accordingly, when all external lines are busy, the phone stores the reservation information for the external line selected when the external line is available, and stores the reservation information in the memory when the corresponding external line is not busy. To provide an extremely convenient line reservation system for a button telephone device, which allows exclusive connection to an external line compatible only with the telephone for a certain period of time in accordance with availability reservation information.

The details of the present invention will be explained below with reference to figures showing embodiments, but for convenience, a central office line from a telephone office will be used as an external line, and the line unit will also be referred to as a central office line unit accordingly.

FIG. 1 is a block diagram of the entire system, in which central office lines SL to SLm from the telephone office are individually connected to central office line units SLU, to SLUM, and only voice signals are separated, and each terminal unit TEU, ~given in parallel to TEUn,
Exchange connections with a plurality of telephones MFT, .about.MFT are made via crosspoints within the terminal units TEU, .about.TEUn.

Further, link circuits L to Lp are provided between the terminal units TEU and .about.TEUn, and subsequent exchange between the telephone sets MFT and .about.MFTn is also possible via the aforementioned cross points.

Note that the terminal units TEU, ~TEUn and the telephone MmT
, ~MFL, each has a pair of voice lines VL~VLn.
and data lines DL to DLn are connected by four-wire lines, and voice signals and FS signals ( Data signals are transmitted and received using frequency-shifted signals), and voice lines VL, ~V
From the terminal unit TEU, ~TEU to the telephone M via the neutral point provided in the line transformer between
Power supply to FT, ~M'L is performed.

In addition, main control unit MCU, station line unit SLU
, ~SLUM and the terminal units TEU, ~TEUn are equipped with a processor such as a microprocessor, and the processor of the terminal units TEU, ~TEUn decodes and holds the transmission information etc. from the telephone M'T, ~MmL. At the same time, it decodes and holds incoming call information etc. given from the main control unit MCU, and sends out incoming information etc. to the telephones MFT, ~MFL according to instructions from the unit MCU, while sending outgoing information etc. to the main control unit MCU. The main control unit MCU checks the outgoing information etc. from the terminal units TEU, ~TEUn and the incoming information etc. from the station line units SLU, ~SLUM, and also sets the issuing/receiving debt regulation unit OAD. After checking the information, command information based on these is sent to the station line units SLU, ~SLUM and terminal units TEU, ~TE.
It sends it to Un and controls the exchange operation of the entire system.
On the other hand, the telephones MFT, to MFTn are equipped with the required number of non-locking button switches and indicator lights, and are also equipped with a dial for making a call to a central office line, as well as a telephone circuit and a buzzer or bell for notifying an incoming call, and further, It has a processor and a MODEM (modulator/demodulator), and the processor decodes the information generated by button switch operations and the dial information by dial operations, controls the MODEM, and sends it out as a data signal, while the terminal unit TE
U. The data signal from the MODEM provided in ~TEUn is received by its own MODEM, and the received output is decoded by the processor to turn on the indicator light, ring the buzzer or bell, etc.

FIG. 2 is a block diagram of the station line units SLU, ~SLUM, in which a signal detection circuit DET using a diode bridge circuit and a photo coupler detects a calling signal, and sends it to the processor CPUs as incoming call information. At the same time, the relay HS operates under the control of the processor CPUs, and by turning on the contact hs, a loop circuit is formed via the primary winding of the line transformer LTs. Accordingly, the operation and recovery of the relay HS turns the contact hs on and off, and also sends out a diamond pulse.

FIG. 3 is a block diagram of the terminal units TEU, -TEUn, in which the voice line VL from the telephone MFT is connected to the central office line units SLU, -SLUM via the line transformer LTv and the crosspoint CP as a switching connection circuit. The cross point CP is turned on under control from the main control unit MCU, thereby establishing a predetermined exchange connection. In addition, the data line DL from the telephone MFT is connected to MODEM/MD via a line transformer LTd.
According to the control of the processor CPUt, the MODEM/MOM sends the data signal as an FS signal using audio frequency, while the MODEM/MDM demodulates the FS signal from the telephone MmT into a data signal. , b. It is provided to the set CPUt. Figure 4 shows the station line unit SL by the main control unit MCU.
U, ~SLUM and terminal unit TEU, ~TEUn
Exchange of information with the same unit TEU, ~TEUn
This is a time chart showing the information exchange operation between the telephones MFT and M'L, and first, each unit SLUI to SLU
If there is no incoming/outgoing information on the M, TEU, to TEUn sides, even if the main control unit MCU "starts checking" by sending out a boring signal, the boring signals will be sent out one after another because none of them hold any information. Each unit S
The check ends only by sending to LU, ~SLUM, TEU, ~TEUn, and at the end of the check, "TEU sending start" is sent to terminal units TEU, ~TEUn.
A command is given from the main control unit MCU, whereby all the terminal units TEU, -TEUn simultaneously send data signals to the telephones MFT, -MFTn.

When this data signal transmission is completed, the telephone MFT
,~Data signals are sent from the MFTn side all at once,
If there is any information, that information is held in the terminal units TEU, -TEUn. Telephone MFT
, ~ When the data signal transmission from MFTn ends with "M circle T transmission end", the main control unit MCU again "
However, if there is an "incoming call" from the station line SL after the previous check, this incoming information is given from the station line unit SLU, so the incoming call is immediately sent to the terminal units TEU, ~TEUn. Information is sent out sequentially and held in each unit TEU, -TEUn.

Next, check the station line unit SLU2, and if there is no information, check up to the station line unit SLUM in order, and then move on to check the terminal unit TEU.
If an outgoing call, etc. has been made since the time of the previous check, this is the telephone number M'T,
Since this information is held in the terminal unit TEU by sending the data layer number from together with each terminal unit TEU
,~TEUn also gives this information, and the terminal unit TEU
, sends a transmission confirmation response to the terminal unit TEU2.
From then on, a command to display that the telephone MFT is busy is maintained.

Additionally, if telephone MFT2 has been making an "extension call" since the last check, this information is given only to each terminal unit TEU, ~TEUn, and telephone MFT2
A command to display a busy message is also held in L.

As described above, when the occurrence of information is confirmed, the main control unit MCU sends and receives the necessary information each time, and
The other terminal units TEU, ~TEUn are checked, and each terminal unit T
The data signals representing each information are sent out from EU, .about.TEUn, and the data signals from the telephones MFT, .about.Men Tn are also sent out again.

As a result, each telephone MFT, to MFTn displays an incoming call from the central office line SL, and at the same time, telephones MmT, M'L display that they are in the outgoing state, and others In the telephones MFT3 to MFL, it is displayed that the telephones MFT, . . . MFL are in a busy state.

Note that information such as dialing, call termination, etc. from each telephone set M, to M'Tn is similarly given to each terminal unit by sending a data signal. Therefore, information is exchanged between the main control unit MCU and the central office line units SLU, ~SLU.
All communications between M and the terminal units TEU, ~TEUn are transferred to the telephones MFT, ~MFL at once, and information from the telephones MFT, ~MFL is also transmitted at the same time, so the central office lines SL, ~SLm, and Telephone MFT
, ~ Check the information about each MFL, and each time,
The total time required is significantly reduced compared to sending and receiving information.

In other words, when the office line SL has 4 lines, the telephone MFT has 12 lines, each processor CPU is a 5-bit one, and the clock pulse frequency is 2 MHZ, the instruction execution speed is approximately 30 p/lmsec. Therefore, even if information is generated and information is exchanged accordingly, the time required for each station line unit SLU or terminal unit TEU is about 1msec, and from "start of check" to "start of TEU transmission" The required time is up to 16 hsec.
The data signal transmission speed is about 80 it/se.
c, and one word of the data signal consists of lIBjt', it will take approximately 14 msec from "start of TEU transmission" to the end of data signal transmission to the telephone MFT, and the data signal in the opposite direction will Since the required time is the same, the maximum required time from "check start" to the next "check start" is about 40 to 5 hsec, and there is no perceived delay in the operation of the telephone MFT.

FIG. 5 is a flowchart showing the operating status of the main control unit MCU for executing the above-mentioned information exchange and various controls. , similarly built-in RNM (Random
Control processing is executed while data is being accumulated in the AccessMemo.

First, after "initial state setting", the central office line unit "selects SLU and checks/information analysis of central office line information" is performed, and if "processing required" is YES, "all TEU
Sequentially select the commands based on the station line information, and then
If the power that has completed the information processing from the LU)'' is YES, the terminal unit ``selects the TEU in sequence and analyzes the MFT information'', and if the ``Is processing necessary?'' is YES, the terminal unit Based on the distinction between outgoing calls, extension calls, etc., and the setting information of the departure/arrival shoulder control unit OAD, if it is a “station line call request”, perform the (station line reservation) described later, and then set the station line SL.
~Judge whether the request can be accepted based on whether the SLm is busy or not, and if it is YES, the corresponding SL
After selecting the U/TEU, sending out an operation command, and performing ``timer processing'' to be described later, the cross point CP is controlled to ``close the corresponding communication path'' to establish an exchange connection.

In addition, if it is an "extension call request", link circuits L to Lp
It is determined whether the request can be accepted based on whether or not all of the TEUs are busy, and if the answer is YES, it selects the relevant TEU, sends an operation command, and performs timer processing.
“Closing the corresponding call” is performed.

When the above call state ends, the call is terminated, the corresponding TEU is selected and the recovery command is sent, and the corresponding SLU is selected and the recovery command is sent.
The exchange connection state is restored by opening the corresponding communication path.

However, if "Ability to Accept Requests" 1 is NO, a new call on the "local office line" or "extension line" is not possible due to one of the calls being busy. "Select and send a request rejection command".When these processes are completed, "
After determining whether the information processing from all TEUs has been completed, and performing the "timer detection processing" described later, "sending a command to start transmitting and receiving information with the MFT to all TEUs", the terminal units TEUs, ... TEUn and telephone MFT, ~MFTn
data signals are sent and received between
If “Has information transmission/reception with T been completed?” is YES, the fourth
One cycle between "check start" in the figure ends. Note that (station line reservation) means that the station line reservation for the corresponding station line SL is made by pressing the station line selection button on the telephone MFT before off-hook of the telephone MFT.
In principle, it is assumed that one of the station lines SL to SLm is not in use. M
It is automatically released when FT is not taken off-hook.

In addition, in the case of an "extension call request," the circuit will be restored if there is no response within a predetermined time such as 3 seconds after calling the other party, and in order to regulate these times, A timer is configured in the processor CPUm, and (local line reservation) starts the timer for a certain period of time, and depending on the “extension call request”, the timer for a certain period of time starts, and “selects the corresponding SLU/TEU and issues an operation command.” Sending” and “
In the "timer process" of "select the relevant TEU and send the operation command", each timer is stopped.

Therefore, “has information processing from all TEUs been completed?”
In the next "timer detection process", it is checked that these timers have not timed up, and on this premise, the process moves to the next step.

FIG. 6 is a flowchart showing the operations of the station line units SLU, -SLUM, which are executed by the processors CPUs according to instructions stored in their ROMs.

First, after "initial state setting", "station line state detection/processing storage" is performed, and "Selected from MCU" is YES.
In addition, "Do you want to send information to the MCU?" is YES.
If S, “send stored station line information to MCU”
and “Did you input the input completion signal from the MCU?” is YES.
If it becomes S, sending out the message ends.

Also, if "Send information to MCU" is NO, "input operation command from MCU", and when this is completed, "send command input completion signal to MCU", and then "MC
It executes the operation command from U to close the loop to the station line SL, send out dial pulses, etc.

FIG. 7 is a flowchart showing the operation of the terminal units TEU, -TEUn, which is executed by the processor CPUt in accordance with instructions stored in its own ROM.

First, after "Initial state setting", if "Selected from MCU" is NO, it is determined "Is there a command to start transmitting/receiving information with MFT?", and if this is YES, "Stored information to MFT is sent" is determined. Then, it performs "receiving and processing information from the MFT", and if the content is YES as determined by "need to send to MCU", "memorize it as MFT information to be sent to MCU". Noue, “M to MCU”
Sends an information transmission completion signal with FT.

Also, if “Selected from MCU” is YES,
Determine whether "MFT information is to be sent to the MCU", and if this is YES, the above-mentioned "MFT information to be sent to the MCU" is determined.
The contents stored in "Storing as information" are sent out by "Sending stored MFT information to MCU", and
When the question ``Did you input the input completion signal from U?'' becomes YES, the information transmission ends.

On the other hand, "Do you want to send the MFT information to the MCU?" is NO.
In this case, the command is input from the MCU, and when the command is completed, the command input completion signal is sent to the MCU.
After "processing the input command", it is "stored as information to be sent to the MFT" and held until the aforementioned "sending of stored information to the MFT".

FIG. 8 is a flowchart showing the above-mentioned (station line reservation) operation in detail, and corresponds to the (station line reservation) routine in the "station line call request" shown in FIG. In FIG. 8, any telephone MFTx is connected to any central office line S.
In the case where LY is reserved, if the terminal unit "selects TEUx and inputs and analyzes MFT information" and "Is processing necessary" is YES, then this is the station line "Is SLY reserved" on-hook. The judgment is made based on whether the information indicates that the station line selection button in the state has been pressed down, and if YES, the processor C
Based on the status of each station line SL to SLm stored in the RAM of PUm, check the status of the station line "SLY",
Based on whether the result is busy or not, it is determined whether the reservation can be made, and if the answer is YES, indicating that the station line SLY is not busy, then the reservation information is written to the address of the RAM that stores the status of the station line SLY. Local line “SLY status is reserved for TEUx”.

Next, the station line 'SLY reservation timer is activated' which regulates the above-mentioned fixed time, and the terminal unit 'selects TEUx and sends a station line reservation acceptance command'.

Also, if the station line "SLY reservation" is NO, it means that the off-hook was made before the reservation timer timed out, and the station line "SLY status check" is performed.
The off-hook device determines whether the terminal unit that made the station line reservation is "TEUx", and if the answer is YES, it writes information about the call in progress to the address of the RAM that stores the station line SLY information, and transfers the station line. 'Set the status of SLY to busy' and then set the station line to 'stop the SLY reservation timer'.Next, the station line unit 'selects SLUy and sends a station line connection command' to loop the station line. After completing the above, control the cross point CP and “start the corresponding call path”
do.

After that, a "timer detection process" is performed by checking the status of the reservation timer, and if "Reservation timer has timed out" is YES, it means that a certain period of time has passed without going off-hook after making a reservation for the central office line. After "selecting the TEUx that reserved SLY" and "sending a reservation cancellation command to TEUx," the reservation information for the station line SLY in RAM is deleted, and the non-busy information is sent to the address where it was stored. Write, “Make station line SLY empty.”

In addition, “reservable power r and terminal unit” TEUx
If the result of the determination is NO, the process goes to ◯ in FIG.

In addition, when all station lines SL, ~SLm are busy, the station line reservation information is memorized, and when any island line SLY becomes non-busy, the busy station line reservation is also entered in the station line reservation state. It is possible, and in this case, the following operation should be performed.

FIG. 9 is a flowchart corresponding to FIG. 5 of the busy station line reservation operation, and FIG. 10 is a flowchart corresponding to the same FIG. 8.

In Fig. 9, a "reservation process as soon as the central office line becomes vacant" is added at the end of the "end" routine, and as a result, the corresponding call path is "released" when any "call ends", and any ``Reservation processing'' is performed when the central office line SL becomes non-busy.

FIG. 10 shows the above operation in more detail. When "Can I make a reservation?" is NO, "Check the status of other station lines" to check the RMM addresses corresponding to all station lines SL, ~S-. After checking all, if "Are all station lines busy/reserved?" is YES, then the busy reservation memo I of the station line "SLY"
By storing TEUx, reservation information is written to a predetermined address in the RAM as soon as it becomes empty, indicating that the relationship with the terminal unit TEUx is immediately set to the station line reserved state when the station line SLY becomes non-busy.

Also, after "making SLY empty", "check the busy reservation memory of each station line", and as a result, the reservation information is stored as soon as it becomes empty, and "Is there reserved TEU?" shows Y.
If it is an ES, the terminal unit "TEUx" to be reserved is
RA
Normal reservation information is stored in a predetermined address of M.

Note that the other operations are the same as those in FIG. 8, and ■ in FIG. 10 leads to ■ in FIG. 9.

In addition, as the external line, in addition to a central office line, a private branch exchange terminal circuit or a dedicated line may be used, and the fixed time for reservations can be arbitrarily set according to conditions, and various other modifications are possible.

As is clear from the above explanation, the present invention makes it possible to provide a complete line reservation service compared to conventional button telephone devices, and makes it easier to make calls from the telephone, so it can be used in a variety of applications. A great advantage can be obtained in the button telephone device.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram of the entire system, Fig. 2 is a block diagram of the central office line unit, Fig. 3 is a block diagram of the terminal unit, and Fig. 4 is a block diagram of the main control unit. A time chart showing the information exchange operation between units and between telephones, Fig. 5 is a flowchart showing the operation in the main control unit to execute the operation of Fig. 4, and Fig. 6 shows the operation of the central office line unit. 7 is a flowchart showing the operation of the terminal unit,
FIG. 8 is a flowchart showing details of the central office line reservation operation, FIG. 9 is a flowchart of the busy central office line reservation operation corresponding to FIG. 5, and FIG. 10 is a flowchart of the same machine corresponding to FIG. 8. MCU... Main control unit, SLU, ~SLU
M・・・・・・Station line unit (line unit), TBU
, ~TEUn...Terminal unit, MFT, ~M
『L...Telephone (button type telephone), OAD・
...Call restriction unit, SL~SLm...
Office line (external line), VL, ~VLn...Voice line, DL, ~DLn...Data line, CPUm
, CPUs, CPUt, . ．． 、． ·centre. o setusa. Figure 2 Figure 3 Dimensions Vertical Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A line unit that performs a connection operation with an external line, and a plurality of line units that are connected to a key telephone via a pair of voice lines and a data line, and that transmit and receive data signals to and from the key telephone via the data line. A terminal unit, an exchange connection circuit for making an exchange connection between the voice line connected to each terminal unit and the external line accommodated in the line unit, In a button telephone device comprising a main control unit equipped with a processor for controlling each of the above-mentioned units and an exchange connection circuit, the main control unit selects all of the external lines in accordance with information obtained by operating an external line selection button of the key telephone. is busy, stores the reservation information in the memory as soon as the external line corresponding to the external line selection button of the button telephone is free, and stores the reservation information in the memory as soon as the external line corresponding to the external line is not busy. A line reservation system for a button telephone device, characterized in that, according to reservation information, only the button telephone is allowed to exclusively connect to the corresponding external line for a certain period of time.